The 1.4 GHz radio properties of hard X-ray selected AGN

TL;DR

This study investigates the radio properties of hard X-ray selected AGN, revealing correlations between radio and high-energy emissions, and demonstrating diverse radio morphologies linked to accretion processes.

Contribution

It provides the first comprehensive analysis of radio emissions in a complete sample of hard X-ray AGN, highlighting correlations and morphological diversity.

Findings

Majority of sources detected in radio band.

Significant correlation between radio flux and high-energy X-ray emission.

Radio morphologies range from unresolved cores to extended structures.

Abstract

We have analyzed the NVSS and SUMSS data at 1.4 GHz and 843 MHz for a well defined complete sample of hard X-ray AGN observed by INTEGRAL. A large number (70/79) of sources are detected in the radio band, showing a wide range of radio morphologies, from unresolved or slightly resolved cores to extended emission over several hundreds of kpc scales. The radio fluxes have been correlated with the 2-10 keV and 20-100 keV emission, revealing significant correlations with slopes consistent with those expected for radiatively efficient accreting systems. The high energy emission coming from the inner accretion regions correlates with the radio emission averaged over hundreds of kpc scales (i.e., thousands of years).